| Summary: | Able to softlockup kernel-PAE-2.6.35.13-92.fc14.i686 when running with multiple CPUs (smp) | ||||||
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| Product: | [Fedora] Fedora | Reporter: | David Shaw <dshaw> | ||||
| Component: | kernel | Assignee: | Kernel Maintainer List <kernel-maint> | ||||
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||
| Severity: | high | Docs Contact: | |||||
| Priority: | unspecified | ||||||
| Version: | 14 | CC: | gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda | ||||
| Target Milestone: | --- | ||||||
| Target Release: | --- | ||||||
| Hardware: | Unspecified | ||||||
| OS: | Unspecified | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2011-10-05 19:19:10 UTC | Type: | --- | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Attachments: |
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This bug seems to have been resolved (intentionally or not) in kernel-PAE-2.6.35.14-96.fc14.i686 |
Created attachment 516206 [details] Program to softlockup the kernel Description of problem: Running a program that does a lot of fork/waitpids from multiple threads can cause the kernel to softlockup. It does not recover afterwards. This seems to only happen if there is multiple CPUs (I tested with four). Version-Release number of selected component (if applicable): kernel-PAE-2.6.35.13-92.fc14.i686 How reproducible: Every time Steps to Reproduce: 1. Run the attached program Actual results: If the kernel is set to panic on softlockup (kernel.softlockup_panic=1) then there is a panic. Otherwise, the system just hits softlockup over and over again. The system is not usable (not pingable, etc). Expected results: Nothing should happen. Additional info: I also tried this on kernel-PAE-2.6.35.12-88.fc14.i686.rpm and kernel-PAE-2.6.35.13-91.fc14.i686.rpm and saw the same problem. However, I could *not* reproduce this using kernel-PAE-2.6.35.6-45.fc14.i686.rpm (the kernel that shipped with F14).